%------------------Damped cosine子波的时域表达式---------------%
function w = Damped_cosine(dt,N,sigma,f,fa)
    t=-N/2*dt:dt:N/2*dt;
    s1= exp(-(sigma*t).^2).*cos(2*pi*f*t);
    s2=hilbert(s1);
    w=real(s2)*cos(fa)+imag(s2)*sin(fa);
end